JPH0737158B2 - Thermal transfer recording device - Google Patents

Description

The present invention relates to a thermal transfer recording apparatus.

[Conventional technology]

FIG. 8 shows a printing state of a conventional thermal transfer recording apparatus, for example, and FIG. 9 shows a discharged state of the transfer material (4) after the printing is completed. In the figure, (1) is a platen roller,
(21) is a downstream pinch roller pressed against the planter roller during printing with respect to the transfer direction of the transferred material (4), (31) is an upstream pinch roller pressed against the platen roller like the downstream pinch roller, and Downstream pinch roller (2
1), the upstream side pinch roller (31) rotates together with the rotation of the platen roller (1) during printing, holds the material to be transferred, and conveys it to the downstream side. Reference numerals (22) and (32) denote a downstream side pinch roller (21), a downstream side pinch roller arm that holds the upstream side pinch roller (31), and an upstream side pinch roller arm, respectively, and (22a) and (32a) respectively. The fulcrums for the downstream and upstream pinch roller arms, (21a) and (31a) are rotary shafts for the downstream and upstream pinch rollers, respectively. Also (2
Reference numerals 3) and (33) are springs that bias the pinch rollers (21) and (31) so as to apply a predetermined pressure to the platen roller (1).

Reference numeral (5) is a driving cam that moves a pair of pinch rollers (21) and (31) to and from the platen roller, and a driving cam shaft (5) connected to a first drive motor (not shown).
Rotate by a). Further, (24) and (34) are main cams contacting each other, and downstream and upstream driven cams formed at the tips of the downstream and upstream pinch roller arms, respectively.
(6) and (7) hold the material to be transferred after printing,
Paper ejection driving roller and paper ejection driven roller (7a)
Is a rotary shaft of the paper discharge driven roller, (8) is a solenoid for moving the paper discharge driven roller (7) to and from the paper discharge driving roller (6), and (9) is a paper discharge driven roller and solenoid. A paper discharge driven roller arm that directly connects (8) and a thermal head (10).

Next, the operation will be described.

During printing, as shown in FIG. 8, the driving cam (5) is stopped at the reserved position and separated from the driven cam portion, and the downstream pinch roller (21) and the upstream pinch roller (31) are the platen roller (1). Are pressed by springs (23) and (33) with a predetermined pressure, and the transferred material (4) is sandwiched between them, and is rotated together with the rotating platen roller (1) to convey the transferred material (4). To do. On the other hand, at this time, the paper discharge driven roller (7)
The solenoid (8) is in a non-conducting state of electricity, and is in a position separated from the paper ejection driving roller (6) by being opened by a support spring incorporated in the solenoid (8). Next, when the transferred material (4) is discharged after printing is completed, as shown in FIG. 9, the driving cam (5) is rotated in a predetermined direction by a first drive motor (not shown). The pinch rollers (21), (3
1) is separated from the platen roller (1), the material to be transferred (4) is opened, and the discharge driven roller (7) is moved to the discharge driven roller (7) by energizing the solenoid (8) by the second drive source. The material to be transferred (4) is clamped by being pressed against 6), and the paper discharge driving roller (7) rotates to discharge the material to be transferred.

[Problems to be Solved by the Invention]

Since the conventional thermal transfer recording apparatus is configured as described above, in order to perform the contact / separation operation of the first drive source and the pair of paper discharge rollers for performing the contact / separation operation of the pinch roller with respect to the platen roller. It is necessary to install the second drive source, and there is a problem that the cost increases due to an increase in the number of parts.

The present invention has been made in order to solve the above-mentioned problems, and when a driven cam of a downstream pinch roller arm is spread, a paper discharge having an engaging portion that constantly contacts the outside of the cam with a predetermined pressure. The driven roller arm is rotated, and the paper ejection driven roller is pressed against the paper ejection driving roller to sandwich the transfer material after printing is completed, so that the second drive source is unnecessary and the number of parts is reduced. An object is to obtain a cheaper thermal transfer recording apparatus.

[Means for Solving the Problems]

The thermal transfer recording apparatus according to the present invention rotatably supports the paper discharge driven roller at one end, and has the engaging portion at the other end that constantly contacts the outer cam surface of the driven cam of the downstream pinch roller arm at a predetermined pressure. The driven cam is rotated when the driven cam is widened to press the discharged paper driven roller against the discharged paper driving roller, and a discharged paper driven roller arm is provided for sandwiching the transferred material after printing is completed.

[Action]

After printing, the driven cam, which comes into contact by a certain amount of rotation of the driving cam, is spread outward, the pair of pinch rollers with respect to the platen roller are separated, and the transfer material is released.
The paper discharge driven roller arm that has an engagement portion that constantly contacts the outer cam surface of the driven cam of the downstream side pinch roller arm at a predetermined pressure at one end and that holds the paper discharge driven roller rotatably supported at the other end is When the driven cam is expanded, it rotates,
The paper discharge driven roller is pressed against the paper discharge driving roller to sandwich the material to be transferred.

Example of Invention

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional side view showing a printing state, and FIG. 2 is a discharged state after printing is finished. In these figures, the discharge driven roller arm (9), the support shaft (9a), the inclined groove (9b), the outer cam surface (11), the spring (12), the downstream pinch roller arm (2
It is the same as the conventional device except for the portion where the outer cam surface (11) is provided on the outer side of the driven cam (24) in 2). During printing, the driving cam (5) is at a reserved stop position and is apart from the pair of driven cams (24) and (34), but a drive (not shown) connected to the driving cam shaft (5a) after printing is completed. The motor is rotated by a certain amount and comes into contact with the inner cam surfaces of the pair of driven cams (24) to push the pair of pinch roller arms outward. As a result, the material to be transferred (4) is released on the platen roller (1) as in the conventional example, but the driven cam (24) of the downstream pinch roller arm (22) is used.
An engaging portion with the paper discharge driven roller arm (9) is formed on the outer side of the. This engaging portion is composed of one outer cam surface (11) and a spring (12) for constantly contacting the outer cam surface with a predetermined pressure. Further, when the driven cam is spread, the paper discharge driven roller (7) is pressed against the paper discharge driving roller (6) so that the transfer target material (4) is pinched, so that the paper discharge driven roller (7) is almost centrally located. The tilted groove (9b) provided and a support shaft (9) that is implanted in the main body side and is rotatably fitted into the tilted groove (9b).
The rotating part consisting of a) is provided. After the transfer material is discharged, the rotating sheet discharge driving roller is stopped, and as the driving cam rotates and returns to the rest position, the biasing force is always applied to the inside. The spring (12), the inclined groove (9b) and the support shaft (9a) restore and rotate the paper discharge driven roller arm (9), so that the pair of paper discharge rollers are separated from each other. As described above, the contact / separation operation of the pair of paper discharge rollers can be performed by engaging and rotating with the contact / separation operation of the pair of pinch rollers, and the solenoid (8) of the conventional apparatus is not required. Another embodiment of the present invention is shown in FIG. 3 (printing state) and FIG. 4 (sheet discharge state). One of the engaging portions of the downstream pinch roller arm and the paper discharge driven roller arm is, for example, the protrusion or pivot (11) on the former arm side.
a), on the other hand, for example, on the arm side of the latter, the groove or bearing (1
1b) is fitted to form a contact that allows the necessary rotation, and is composed of a spring (12) that constantly applies a predetermined pressure to this contact surface. A support shaft (9a) is provided at the center of the paper discharge driven roller arm, An inclined groove (9b) into which the support shaft is rotatably fitted is attached to the main body side to form a rotating portion.

A third embodiment of the invention is shown in FIG. 5 (printing state), FIG. 6 and FIG. 7 (paper discharge state). The engaging portion of the downstream pinch roller arm and the paper discharge driven roller arm is
Provided on the former arm so that the guide pin (13) implanted so as to be orthogonal to the engaging end side surface of the latter arm and projecting from both side surfaces by a predetermined amount is swingably fitted inside the protruding projecting guide pin. The slotted groove (14) is provided with a spring (12) which is attached to the protruding side of the guide pin and constantly applies a predetermined pressure to the contact surface between the guide pin and the slotted groove. The configurations of the inclined groove and the support shaft for rotating the paper discharge driven roller arm when the driven cam is expanded are the same as those of the previous embodiment and other embodiments. As described above, in both the other embodiment and the third embodiment, the solenoid of the conventional device can be eliminated as in the previous embodiment, but the contact surface of the engaging portion has a feature. That is, in the case of the inclined plane of the previous embodiment, a slight slip occurs, so that the Masatsu coefficient is reduced and both sides are rotated at the same time, but the other examples and the third example The feature is that the rotation-type contact surface is used as a fulcrum to stabilize the rotation. In the thermal transfer recording apparatus having the above-described structure, when the driving cam (5) stopped at the reserved position during printing is rotated by a certain amount by the first drive motor (not shown), the paper discharge operation state after printing is completed It is realized as shown in Figure 2. That is, the transfer target material (4) is released by separating the pair of pinch rollers from the platen roller, and the latter arm ((4)) is engaged via the engaging portion of the downstream side pinch roller arm (22) and the paper discharge driven roller arm (9). 9) is pushed out, and the latter arm (9) is rotated by a reaction with the inclined groove (9b) and the support shaft (9a) which is rotatably fitted in this groove, and the paper discharge driven roller (7) is driven to discharge the paper. The transfer material (4) is pressed against the roller (6) with a predetermined pressure to be ejected. Further, as the main drive cam rotates and returns to the reserved position after the completion of paper ejection, the paper ejection driven roller (7) is returned to the position separated from the paper ejection driving roller (6) by the tension spring (12), Both the pinch roller and the platen roller are brought into pressure contact with each other to return to the printing state of FIG.

〔The invention's effect〕

As described above, according to the present invention, the contact / separation of the pair of pinch rollers and the contact / separation of the pair of paper discharge rollers with respect to the platen roller are performed by one drive motor that rotates the driving cam that is the first drive source. Therefore, the second driving source for separating the pair of paper discharge rollers is not required, the number of parts is reduced, and a cheaper thermal transfer recording apparatus can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional side view showing a state during printing according to an embodiment of the present invention, and FIG. 2 is a sectional side view showing a state during discharging according to an embodiment of the present invention, FIG. 3, FIG. Is a sectional side view showing an engaging portion or the like corresponding to a printing state of another embodiment and a sectional side view showing an engaging portion or the like corresponding to a paper discharge state, FIG. 5, FIG. 6 and FIG. FIG. 7 is a cross-sectional side view showing the engaging portion and the like corresponding to the printing state of the embodiment and a sectional side view showing the engaging portion and the like corresponding to the paper discharge state, and FIG. 7 is a sectional view taken along line VII-VII of FIG. FIG. 8, FIG. 9 and FIG. 9 are a sectional side view showing a state during printing of a conventional thermal transfer recording apparatus and a sectional side view showing a discharged state, respectively. In the figure, (1) is a platen roller, (21) is a downstream pinch roller, (31) is an upstream pinch roller, (22) is a downstream pinch roller arm, (32) is an upstream pinch roller arm, and (24) ) Is a downstream driven cam, (34) is an upstream driven cam, (4) is a material to be transferred, (5) is a driving cam, (6) is a paper ejection driving roller, (7) is a paper ejection driven roller, ( 8) is a solenoid, (9) is a paper discharge driven roller arm, (10) is a thermal head, (11) is a contact surface, and (12) is a tension spring. The same reference numerals in each drawing indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A thermal transfer head, a platen roller that rotates while holding a transfer material and a material to be transferred between the head and the head during printing, and the platen rollers are arranged so as to face each other and one end thereof is swingable. The upstream and downstream pinch roller arms, which are supported and have a driven cam at the other end and are always biased inwardly, are rotatably held at positions facing the platen rollers of each of the pinch roller arms. During printing, upstream and downstream pinch rollers that contact the platen roller with a predetermined pressure by the biasing force to clamp the transfer target material, rotate a predetermined amount after printing, and engage with the inner cam surface of the driven cam. A driving cam that separates the pinch roller from the platen roller to release the transfer material, a delivery driving roller that is provided on the downstream side of the transfer material and faces the transfer material, and rotates when the transfer material is discharged, A paper discharge driven roller provided at a position facing the paper discharge driving roller with the transfer material sandwiched therebetween, one end rotatably supporting the paper discharge driven roller and the other end outside the driven cam of the downstream pinch roller arm. A paper discharge that has an engagement portion that constantly contacts the cam surface with a predetermined pressure and rotates when the driven cam is expanded and presses the paper discharge driven roller against the paper discharge driving roller to sandwich the transfer target material. A thermal transfer recording apparatus having a driven roller arm.